It means that you have a bad/ghost Exchange connector. This happens especially when an Exchange server dies without being properly demoted. In this case, Exchange System Manager (ESM) can’t be used to delete the dead server.

We can use ADSIEDIT.msc (Active Directory Service Interfaces Editor) to force the removal of this dead Exchange server.

Remove Dead MS Exchange ADSIedit.msc Error 929

Under Services, Microsoft Exchange, find the group that no longer exists in your organization, right-clic and delete it.

We can (well, we should) also delete the Active Directory object associated to the old server.

Now keep an eye on your server event logs to make sure that error 929 is no longer showing up.